JPS59100032A - Vehicle bumper and its manufacturing method - Google Patents

Abstract

PURPOSE:To dispense with a back-up beam of steel or the like on the back of a bumper while improving the anticorrosive property of the bumper by filling a reinforcing material comprising resin having foamed resin beads and reinforcing fibers in a cavity of a resin bumper body. CONSTITUTION:A resin bumper body 11 has a cavity 12 formed of respective members 11a-11d. The cavity 12 is filled with an reinforcing material 20 through a reinforcing material filling hole 15 formed in the back member 11d. The reinforcing material 20 is constituted from foamed resin beads 20a and resin 20b interposed between these foamed beads 20a and mixed with glass or reinforcing fibers. Thus, since the respective foamed beads 20a are interconnected in the form of a honeycomb by said reinforcing fibers, the reinforcing effect is improved to dispense with a back-up beam. Also, the anticorrosive property is improved since metal material is not used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bumper for i-vehicles and a method for manufacturing the same, which has excellent reinforcing effect, eliminates the need for a backup beam such as steel on the side of the bumper, and is compared to a steel bumper. It is an object of the present invention to provide a bumper for a vehicle that has less damage and can significantly improve corrosion resistance, and a method for manufacturing the same.

Conventionally existing single-use bumpers are as shown in Figure 1.
It has a structure in which a back-up bibum 3 made of steel is attached to a U-shaped open part 2 of a resin breadboard body l made of polypropylene or the like having a U-shaped cross section with bolts and nuts. In FIG. 1, 4 is a reinforcing member, and 5 is a mounting bolt.

The above-mentioned known vehicle bumper has the following drawbacks. Firstly, since the rigidity of the resin pamba body 1 alone is insufficient, a steel back-up beam 3 is required, which increases material costs and the number of steps. Secondly, the bank up beam 3 needs to be treated to prevent rust. Thirdly, due to the difference in linear expansion between steel and resin, the joint must have a floating structure, which is likely to cause thermal deformation due to the above factors. Fourth, the weight of the vehicle increases. Fifth, the back-up beam 3 is configured to have a box cross-section, and a subassembly between the back-up beam 3 and the mounting bolt 5 (or the bracket λ) is required, which requires a lot of assembly man-hours.

The present invention has been improved to eliminate all of the above-mentioned drawbacks.

The gist of the present invention is L. A resin breadboard body has hollow parts formed in the upper, lower, front, and rear members, and the hollow parts are filled with a reinforcing material made of a resin having resin foam beads and reinforcing fibers. A vehicle bumper that is characterized by the fact that it is

2. A method for manufacturing a bumper for a vehicle, characterized in that after blow-forming a bumper body having a hollow portion formed therein, the hollow portion is filled with foamed resin beads, reinforcing fibers, and resin.

Next, embodiments of the present invention shown in the drawings will be described in detail as follows.

The pamper main body 11 made of resin is made by blow molding resin such as polypropylene or polyethylene, and includes an upper surface member 11 a , a lower surface member 11 b , a previous member LI C1 and a rear member 11
A hollow portion 12 is provided by d and is formed in a box cross section. Reference numerals 13 and 14 designate flanges 9 and 15 protruding toward the rear member lid, holes for filling reinforcing members, and 16 a mounting bracket. The above-mentioned reinforcing member filling hole 15
Then, the hollow part 12 is filled with reinforcing material W. As shown in FIG. 3, the reinforcing material 2u includes foamed beads 20a made of polyethylene or the like and the foamed beads 20a described above.

20 a unsaturated polyester resin mixed with glass, vinylon or other reinforcing fibers, epoxy resin, phenolic resin, or other resin 20 b
It is constructed by intervening.

As shown in FIG. 4, the final mold for forming the upper body bumper body 11 consists of a female mold 30 and a male mold 31.
Insert the mounting bracket 16 into the tip.

Next, a bumper body 11 as shown in FIG. 2 is formed by blow molding polypropylene, polyethylene or other resin using the molds 30 and 31 described above. A first embodiment of an apparatus for manufacturing a wheel bumper according to the present invention using the bumper body 11 described above is an apparatus shown in FIG. The above device includes a stirrer 41 rotated by a motor M in a tank 40, and a resin injection port 42 in the upper part of the tank 40. A bead inlet 43 and a danwei inlet 44 are provided,
A valve 47 connects the bottom of the tank 40 and the cylinder 46 through a pipe 46. A piston 47 inside the cylinder 45, which inserts the tip of the cylinder 45 into the reinforcing material filling hole 15 of the resin bumper body 11, is operated by an air or hydraulic cylinder (not shown), and is inserted into the cylinder 45 from a pipe 46.
The reinforcing material 20 that has been fed into the housing is press-fitted into the hollow portion 12 of the shibamba main body 11 by the piston 47. As a second embodiment of the apparatus for manufacturing table bumpers, there is an apparatus shown in FIG. In this device, a filling pipe 50 inserted into a reinforcing material filling hole 15 of a bumper body 11 is provided with an intake port 51 for the reinforcing material 20 and an air inlet 52, as well as a valve. It is connected to the Piston Rondo Group.

The reinforcing material intake port 51 and the hopper 57 are connected by a hose 58, and the reinforcing material 20 is filled into the hopper.

When the valve & is opened and air is passed through the air inlet 52, the reinforcing material 20 in the hopper 57 is filled with the air into the hollow part 12 in the bumper body 1.1.

When filling is completed, actuate the piston group, close the valve 53 in the direction of the arrow A, push out the reinforcing material remaining in the filling vibe 50 into the hollow part 12 in the bumper body 11, and close the reinforcing material intake port 51. .

Next, several embodiments of the manufacturing process for filling the reinforcing material 20 into the pump body H will be described below.

First Example: The hollow part ν in the bumper body 11 is filled with foamed beads 20a and reinforcing fibers in advance, and then resin is injected.

Second Example: The hollow part 12 in the Bamba main body 11 is filled with 20 m of foamed beads in advance, and then the resin 20b mixed with reinforcing fibers is injected.

Third Example: Foamed beads 20a and resin 20b mixed with reinforcing fibers are simultaneously injected into the hollow part 12 of the Bumba main body 11.

In the present invention, reinforcing fibers such as glass and vinylon are inserted between the foam beads and they are connected in a honeycomb shape, so the reinforcing effect is similar to that of providing countless fine ribs in the hollow part of the Bamba body. This eliminates the need for a backup beam such as steel on the bumper side. Also, as a characteristic of the resin having fibers, it absorbs a lot of energy until it breaks, so there is less damage compared to steel bumpers. Furthermore, since all the members are made of resin without using a gold maple member, there are effects such as significantly improved corrosion resistance.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a known vehicle bumper, FIG. 2 is a perspective view including a longitudinal section of the vehicle bumper of the present invention, FIG. 3 is an enlarged cross-sectional view of a reinforcing material, and FIG. 4 is a blow molding die. Some cross-sectional views,
FIG. 5 is a partially cutaway front view of the first embodiment of the manufacturing apparatus, and FIG. 6 is a longitudinal sectional view of the second embodiment of the manufacturing apparatus. 11...Resin pamper body %11a...Top surface of resin pamper main body, iib...Same lower m, iic...
Same front, lid... Same rear, 12... Hollow part %20... Reinforcement material. Figure 5 161- Figure 6

Claims (1)

[Scope of Claims] t. A resin pumper main body having hollow parts formed in the upper, lower, front and rear members, the hollow parts being filled with a reinforcing material made of a resin having resin foam beads and reinforcing fibers. A vehicle bumper that is characterized by a 2. A method for manufacturing a bumper for a vehicle, which comprises blow-forming a bumper body having a hollow portion formed therein, and then filling the hollow portion with foamed resin beads, reinforcing fibers, and resin.